CVE-2003-1117 in RealSystem Server
Summary
by MITRE
Buffer overflow in RealSystem Server 6.x, 7.x and 8.x, and RealSystem Proxy 8.x, related to URL error handling, allows remote attackers to cause a denial of service and possibly execute arbitrary code.
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Analysis
by VulDB Data Team • 11/19/2024
The vulnerability identified as CVE-2003-1117 represents a critical buffer overflow flaw affecting RealSystem Server versions 6.x through 8.x and RealSystem Proxy 8.x products. This security weakness stems from inadequate input validation within the URL error handling mechanisms of these multimedia streaming applications. The flaw manifests when the software processes malformed or excessively long URLs that trigger buffer overflow conditions during error message generation. The vulnerability operates at the application layer and specifically targets the handling of web requests that contain malformed Uniform Resource Locators, making it particularly dangerous for systems that process user-provided URL data.
The technical implementation of this buffer overflow occurs when the RealSystem software attempts to construct error messages for malformed URLs without proper bounds checking on input data. When an attacker crafts a specially crafted URL that exceeds the allocated buffer space, the excess data overflows into adjacent memory regions, potentially corrupting critical program structures or executable code. This condition can be exploited to redirect program execution flow, enabling remote code execution capabilities. The vulnerability's classification aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios. According to the ATT&CK framework, this vulnerability maps to T1190 - Exploit Public-Facing Application, as it targets publicly accessible web services that process external input.
The operational impact of CVE-2003-1117 extends beyond simple denial of service conditions to encompass potential complete system compromise. Attackers exploiting this vulnerability can cause denial of service by crashing the affected RealSystem services, rendering multimedia streaming capabilities unavailable to legitimate users. More critically, the buffer overflow condition can be leveraged to execute arbitrary code with the privileges of the affected service account, potentially enabling attackers to gain full control over the compromised system. The vulnerability affects organizations running RealSystem servers in production environments, particularly those serving streaming media content over the internet where user input is processed. Systems that rely on RealSystem for media delivery and proxy services are especially at risk since these applications often run with elevated privileges and handle untrusted network input.
Mitigation strategies for CVE-2003-1117 require immediate action through official vendor patches and updates. Organizations should prioritize applying the security updates released by RealNetworks to address this vulnerability in their deployed systems. Network segmentation and access controls should be implemented to limit exposure of affected services to untrusted networks. Input validation measures should be strengthened at the application level to prevent malformed URLs from reaching vulnerable code paths. Additionally, implementing intrusion detection systems and monitoring network traffic for suspicious URL patterns can help detect exploitation attempts. The vulnerability demonstrates the importance of proper bounds checking in network service applications and underscores the necessity of regular security assessments for multimedia streaming platforms. Organizations should also consider implementing application whitelisting policies and restricting the execution of untrusted code to minimize potential impact from similar vulnerabilities.